Williams tech boss Paddy Lowe admits the integration of the mandatory Halo cockpit safety device into next year's car has been challenging.
The controversial new component will forever change Formula 1's aesthetics from next season, but so far it's incorporation has been a difficult process.
"It's a big project to put that in the car," Lowe told Motorsport.com.
"We're still working on it, and the integration is quite difficult. There are very high loads to accommodate, so I think the bigger impact is structural rather than aerodynamic."
As each team works on the device's incorporation, Lowe believes only minimal performance gains are on the cards.
"There is some performance [in it] I guess," said the Williams boss.
"Probably the major area is how efficiently you can provide the mounting requirements to meet the loads – how much weight do you have to throw at that problem? Because it's all weight.
"There are some minor aerodynamic effects. We haven't seen it as a huge project – the detriment is not particularly large. There is some room for manoeuvre there, but not a lot."
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